1873.] 1"1 [Horn. 



ately shining. Head dark piceo-testaceous, occiput piceous. Thorax 

 piceo-testaceous, large discal spot nearly black. Elytra with ten entire 

 striae, coarsely punctured, outer striae It ss deep tut with coaiser punc 

 tures, intervals flat very finely and sparsely punctulate. Body beneath 

 and legs piceous. Mesosternum simple, prosterum finely longitudinally 

 carinate. Length .20-.22 inch ; 5-3.5 mm. 



This species represents among those of the present section P. nomatus 

 of the preceding. 



Specimens occur from Xorth Carolina, Missouri, Illinois and Louisiana. 



P, punctatostriatus, n. sp. 



Broadly oval, piceo-testaceous, gradually paler toward the margins. 

 Head moderately punctured, occiput and middle of clypeus piceous. 

 Thorax finely and densely punctured. Elytra scarcely longer than wide, 

 feebty convex, with ten entire striae coarsely punctured, the external more 

 coarsely punctured. Intervals flat densely punctulate, the fifth with an 

 irregular row of coarser punctures. Body beneath nearly black. Meso- 

 and prosternum simple. Length .20 inch ; 5 mm. 



The most broadly oval species of the genus. 



One specimen Fort Tejon, California. 



P. imbellis, Lee. Proc. Acad. 1861, p. 341 ; ? dorsalis Hydro'), ) Motsch. 

 Bull. Mosc. 1859, III, p. 177. 



Oblong oval, more narrowed in front, piceous, margin paler, surface 

 moderately densely punctulate and shining. Outer four striae of elytra 

 represented by four entire rows of large punctures, discal striae oblitera- 

 ted except at apex. Mesosternum with transverse elevated line in front 

 of coxae. Body beneath piceous, tibiae somewhat paler. Length .20-.22 

 inch ; 5-5.5 mm. 



The typical specimen is immature and the colors as described arc there- 

 fore much paler. Hydrobius dorsalis, Motsch. agrees exactly in descrip- 

 tion with this species, and should they be identical the name should be 

 used. 



California and New Mexico. 



P. fimbriatus, Mels. Proc Acad. II, p. 101 ; Lee. Pr. Acad. 1855, p. 

 369 ; semistriatus, Zimm. Trans. Ent. Soc. 1869, p. 250. 



Oblong oval, similar in color to the preceding, more finely and less 

 densely punctured. Lateral striae of elytra replaced by r sparsely and very 

 irregularly placed coarser punctures, stria) scarcely evident at apex. 

 Mesosternum with faintly elevated transverse carina. Body r beneath and 

 legs piceous. Length .'20 inch ; 5 mm. 



The striae at apex at best are scarcely visible and at times are entirely 

 obsolete, the apex being punctured like the rest of the surface. The 

 'fiat us. Zimm. is an exact reproduction of the Melsheimer type. 



Canada and the Middle States. 



P, lacustris, Lee. Proc. Acad. 1855, p. 369. 



Differs from the preceding by its smaller size, more elongate form, less 

 dense punctuation and by the surface being nearly evenly punctured, the 



